<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item, index) in goods" :key="index" class="menu-item" :class="{'current': currentIndex===index}" @click="selectMenu(index, $event)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>
            {{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook" :key="item.index">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px" :key="food.index" @click="selectFood(food,$event)">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <div class="desc">{{food.description}}</div>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span v-show="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
                </div>
                <div class="control-wrapper">
                  <cartcontrol :food="food" @cart-add="_drop"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart ref="shopcart" :select-foods="selectFoods" class="shopcart" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
    <food :food="selectedFood" ref="food" @cart-add="_drop"></food>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import shopcart from 'components/shopcart/shopcart'
import Cartcontrol from 'components/cartcontrol/cartcontrol'
import food from 'components/food/food'
import Food from '../food/food'
const ERR_OK = 0
export default {
  name: 'Goods',
  props: {
    seller: {
      type: Object
    }
  },
  components: {
    Food,
    Cartcontrol,
    shopcart,
    food
  },
  data () {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  created () {
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee']
    this.$http.get('/api/goods').then((response) => {
      response = response.body
      if (response.errno === ERR_OK) {
        this.goods = response.data
        this.$nextTick(() => {
          this._initScroll()
          this._calculateHeight()
        })
      }
    })
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let heigth2 = this.listHeight[i + 1]
        if (!heigth2 || (this.scrollY >= height1 && this.scrollY < heigth2)) {
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let Foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            Foods.push(food)
          }
        })
      })
      return Foods
    }
  },
  methods: {
    selectMenu (index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodWrapper.getElementsByClassName('food-list-hook')
      let el = foodList[index]
      this.foodScroll.scrollToElement(el, 300)
    },
    _drop (target) {
      // 体验优化，异步执行下落动画
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    },
    _initScroll () {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })
      this.foodScroll = new BScroll(this.$refs.foodWrapper, {
        click: true,
        probeType: 3
      })
      this.foodScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    _calculateHeight () {
      let foodlist = this.$refs.foodWrapper.getElementsByClassName('food-list-hook')
      let Height = 0
      this.listHeight.push(Height)
      for (let i = 0; i < foodlist.length; i++) {
        let item = foodlist[i]
        Height += item.clientHeight
        this.listHeight.push(Height)
      }
    },
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.show()
    }
  }
}
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import "../../common/stylus/mixin.styl"
  .goods
    display flex
    position absolute
    top 181px
    bottom 46px
    width 100%
    overflow hidden
    .menu-wrapper
      flex 0 0 80px
      width 80px
      background #f3f5f7
      .menu-item
        display table
        height 54px
        width 56px
        line-height 14px
        padding 0 12px
        &.current
          position relative
          margin-top -1px
          z-index 10
          background #fff
          font-weight 700
          .text
            border-none()
        .icon
          display inline-block
          vertical-align top
          width 12px
          height 12px
          margin-right 1px
          margin-bottom 2px
          background-repeat no-repeat
          background-size 12px 12px
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.invoice
            bg-image('invoice_3')
          &.guarantee
            bg-image('guarantee_3')
          &.special
            bg-image('special_3')
        .text
          display table-cell
          width 56px
          vertical-align middle
          border-1px(rgba(7,17,27,0.1))
          font-size 12px
    .foods-wrapper
      flex 1
      .title
        padding-left 14px
        height 26px
        line-height 26px
        border-left 3px solid #d9dde1
        font-size 12px
        color rgb(147, 153, 159)
        background #f3f5f7
      .food-item
        display flex
        margin 18px
        padding-bottom 18px
        border-1px(rgba(7,17,27,0.1))
        &:last-child
          border-none()
          margin-bottom 0
        .icon
          flex 0 0 57px
          margin-right 10px
        .content
          flex 1
          .name
            margin 2px 0 8px 0
            height 14px
            line-height 14px
            font-size 14px
            color rgb(7, 17, 27)
          .desc
            padding-bottom 8px
            line-height 12px
            font-size 10px
            color rgb(147,153,159)
          .extra
            line-height 10px
            font-size 10px
            color rgb(147,153,159)
            .count
              margin-right 12px
          .price
            line-height 24px
            font-weight 700
            .now
              margin-right 8px
              font-size 14px
              color rgb(240,20,20)
            .old
              text-decoration line-through
              font-size 10px
              color rgb(147,153,159)
          .control-wrapper
            position absolute
            right 0
            bottom 12px
</style>
